quote:
Originally posted by lim118
To clean or not to clean and if so how is perhaps one of the most asked about question. I follow the simple rule of "NEVER" .
Having said that, a few collector mates have tried digital ultrasonic gizzmos and I am getting very mixed feedbacks about them...ranging from "Brillant" to 'Mediocre". I am wondering whether any member here have tried them.
I have tried them in the lab , there are many machines on sale that only vibrate
A real ultrasonic is expensive
They are mostly used by jewellers and then together with specialised mixtures of acids detergents and reducing agents
The only advantage over a conventional dip is that they are fast and reach inside intricate woven jewelleray bracelets
The reason the results are mixed is because of the quality of the coin before cleaning
A real uncirculated (non copper coin ) will mostly come out a lot better it you haven't let it bang around the bottom of the machine
But in my opinion this type of cleaning will be visible under magnification on many coins